Abstract

Some philosophers and historians of science have suggested that the meanings of scientific terms change in the course of the history of science in such a way that the comparison of successive theories becomes impossible. This claim of "incommensurability", usually associated with Thomas Kuhn and Paul Feyerabend, has attracted attention for its relativist and anti-rationalist implications. It would seem to make the choice between two theories into a random affair, not one of direct comparison. ;The principal attempts to defeat this claim are based either on Saul Kripke and Hilary Putnam's causal theory of reference, first proposed as an account of the reference of proper names, or on Donald Davidson's general argument that all languages are inter-translatable. However, the former is inappropriate as a reply to incommensurability and the latter must be modified before it can serve as a procedure for theory-comparison. After looking at these two replies in detail, the dissertation proposes a method for comparing theories. ;Davidson's argument against incommensurability is adapted so that his interpretive method can serve as the basis of a procedure for comparing scientific theories. Certain constraints on interpretation are spelt out in order to arrive at a unique way of isolating the agreements and disagreements among theories. The main attraction of the interpretive approach is that it consists of a descriptional account of meaning which is also holistic. That is to say, it identifies a term from one theory with a term from another on the basis of the overlap between the two theories, but without relying on the analytic-synthetic distinction. ;A number of case studies are used to demonstrate how theories can be compared and their concepts matched up. One of the consequences of this approach is that transitivity in the translation of concepts will generally break down. But that does not force an anti-realist position in the philosophy of science. To justify this claim, a discussion of scientific taxonomy is undertaken and criticisms are made of the essentialist conception of natural kinds